18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents RE: Retirement How does your ideal retirement differ from reality, and what can we do to better align the two? Retirement Traps to Avoid Beware of these traps that could upend your retirement. A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit.